This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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adj. Not yet hatched.

Not hatched; not having left the egg.

Not matured and brought to light; not disclosed.

Not hatched or marked with cuts or lines; not scratched or injured: applied in the quotations to a rapier not yet used in fight, both literally and figuratively.

adj. not yet emerged from an egg

"Walser, a typical 19th century white male, is unwilling to consider an egalitarian relationship with a woman, and the possibility of his own vulnerability doesn't even occur to him--as Carter tells us, Walser is 'unhatched', a man who's experienced much but who hasn't allowed any of his experiences to truly affect him."

unborn   

dude/some    half-fledged    newly-hatched    soft-boiled    jacana